EP1126499A2 - Panneau d'affichage à plasma à décharge de surface à consommation réduite - Google Patents

Panneau d'affichage à plasma à décharge de surface à consommation réduite Download PDF

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Publication number
EP1126499A2
EP1126499A2 EP01300656A EP01300656A EP1126499A2 EP 1126499 A2 EP1126499 A2 EP 1126499A2 EP 01300656 A EP01300656 A EP 01300656A EP 01300656 A EP01300656 A EP 01300656A EP 1126499 A2 EP1126499 A2 EP 1126499A2
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EP
European Patent Office
Prior art keywords
electrodes
display device
dielectric layer
type display
electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01300656A
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German (de)
English (en)
Other versions
EP1126499A3 (fr
Inventor
Yuusuke Takada
Ryuichi Murai
Akira Shiokawa
Katutoshi Shindo
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to EP06020344A priority Critical patent/EP1770745A3/fr
Publication of EP1126499A2 publication Critical patent/EP1126499A2/fr
Publication of EP1126499A3 publication Critical patent/EP1126499A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/22—Electrodes, e.g. special shape, material or configuration
    • H01J11/24—Sustain electrodes or scan electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
    • H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides of the discharge space
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/38—Dielectric or insulating layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/22—Electrodes
    • H01J2211/24—Sustain electrodes or scan electrodes
    • H01J2211/245—Shape, e.g. cross section or pattern
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/22—Electrodes
    • H01J2211/32—Disposition of the electrodes
    • H01J2211/323—Mutual disposition of electrodes

Definitions

  • the present invention relates to a surface-discharge type display device used for image display or the like, and in particular relates to dielectrics in the display device.
  • surface-discharge type display devices which use plasma surface discharge processes, such as a PALC (plasma address liquid crystal) and a PDP (plasma display panel), have become a focus of attention as color display devices that enable large-size, slimline panels to be produced. Especially, expectations are running high for the commercialization of PDPs.
  • PALC plasma address liquid crystal
  • PDP plasma display panel
  • FIG. 1 is a partial perspective and sectional view of a conventional, typical PDP
  • FIG. 2 is an expanded sectional view of part of the PDP shown in FIG. 1, looking at in a direction x.
  • a front glass substrate 11 and a back glass substrate 12 are set facing each other in parallel, with barrier ribs 19 being interposed in between.
  • a plurality of display electrodes 13 and a plurality of display scan electrodes 14 having a stripe shape are alternately aligned so as to be parallel to each other.
  • the surface of the front glass substrate 11 on which the plurality of display electrodes 13 and the plurality of display scan electrodes 14 have been arranged is then coated with a dielectric layer 15 made of lead glass or the like to insulate each electrode, as shown in FIG. 2.
  • the surface of the dielectric layer 15 is coated with a protective film 16 of magnesium oxide (MgO). This forms a front panel.
  • MgO magnesium oxide
  • a plurality of address electrodes 17 (only four of them are shown in FIG. 1) having a stripe shape are aligned in parallel to each other.
  • the surface of the back glass substrate 12 on which the plurality of address electrodes 17 have been arranged is then coated with a dielectric layer 18 made of lead glass or the like.
  • the barrier ribs 19 are formed between neighboring address electrodes 17.
  • phosphor layers 20R, 20G, and 20B in each of the three colors red (R), green (G), and blue (B) are applied to the gaps between neighboring barrier ribs 19 on the dielectric layer 18. This forms a back panel.
  • Discharge spaces 21 between the front panel and the back panel are filled with an inert gas.
  • the areas within these discharges spaces 21 where the plurality of pairs of electrodes 13 and 14 intersect with the plurality of address electrodes 17 are cells for light emission.
  • a voltage equal to or greater than a discharge starting voltage is applied to display scan electrodes 14 and address electrodes 17 in cells which are to be illuminated, to induce an address discharge.
  • a pulse voltage is applied to each pair of display electrode 13 and display scan electrode 14 arranged on the same surface, to initiate a sustain discharge in the cells in which wall charges have been accumulated. Due to this sustain discharge, ultraviolet light is generated and excites phosphor layers 20R, 20G, and 20B, as a result of which visible light of the three primary colors red, green, and blue is generated and subjected to an additive process. Hence a full-color display is produced.
  • the amount of current flowing through each of the display electrodes 13 and display scan electrodes 14 during the sustain discharge is known to be dependent on the capacitance of the dielectric layer 15.
  • the dielectric layer 15 of lead glass which is commonly used in the art, has a relative permittivity of 9 to 12, and therefore has a high capacitance. Accordingly, a large amount of current flows through each electrode during the sustain discharge, which increases the panel's power consumption.
  • This problem is not confined to PDPs, but may occur in other surface-discharge type display devices such as PALCs that use similar surface discharge processes.
  • the present invention aims to provide a surface-discharge type display device that can reduce power consumption without causing illumination failures.
  • a surface-discharge type display device including: a first panel including a first substrate and a plurality of electrode pairs which are aligned on a main surface of the first substrate and are each made up of a first electrode and a second electrode; and a second panel including a second substrate, a plurality of electrodes aligned on a main surface of the second substrate, and a plurality of barrier ribs aligned on the main surface of the second substrate, the second panel being placed parallel to the first panel with the plurality of barrier ribs being interposed in between, so that the plurality of electrodes face the plurality of electrode pairs, a discharge gas being enclosed in discharge spaces which are formed between the first panel -and the second panel and are separated from each other by the plurality of barrier ribs, and the surface-discharge type display device producing an image display by using a surface discharge induced between the first and second electrodes, wherein the first and second electrodes are coated with a first dielectric layer, and an area that has a lower relative permit
  • Such an area having a lower relative permittivity than the first dielectric layer may be formed by disposing a second dielectric layer having a lower relative permittivity than the first dielectric layer between the first and second electrodes.
  • the formation of this second dielectric layer may be done using metal masking or nozzle injection.
  • the lower relative permittivity area may be formed by providing the first dielectric layer with a groove between the first and second electrodes in such a way that the bottom of the groove is closer to the first substrate than the surfaces of the first and second electrodes.
  • a groove is filled with a discharge gas whose relative permittivity is about 1, so that the panel's power consumption is reduced.
  • the first dielectric layer may be provided with a hollow instead of the groove. The formation of such a groove or hollow is done using sandblasting or a dielectric paste.
  • the aspect ratio which is the thickness-to-width ratio of each of the first and second electrodes may be in the range of 0.07 to 2.0. In so doing, not only the discharge spaces are widened but also the opening ratio of the panel is increased, which improves the panel's luminous efficiency.
  • the surface-discharge type display device of the invention can reduce the power consumption without causing illumination failures during sustain discharge.
  • FIG. 3 is a schematic plan view of a PDP 100 from which a front glass substrate 101 has been removed
  • FIG. 4 is a partial perspective and sectional view of the PDP 100. Note that in FIG. 3 some of display electrodes 103, display scan electrodes 104, and address electrodes 108 are omitted for simplicity's sake. A construction of this PDP 100 is explained using these drawings.
  • the PDP 100 is roughly made up of a front glass substrate 101 (not illustrated), a back grass substrate 102, n display electrodes 103, n display scan electrodes 104, m address electrodes 108, and an airtight sealing layer 121 (the diagonally shaded area in the drawing).
  • the n display electrodes 103, the n display scan electrodes 104, and the m address electrodes 108 together form a matrix of a three-electrode structure.
  • the areas where the pairs of electrodes 103 and 104 intersect with the address electrodes 108 are cells.
  • the front glass substrate 101 and the back glass substrate 102 are set facing each other in parallel, with stripe-shaped barrier ribs 110 being interposed in between.
  • the front glass substrate 101, the display electrodes 103, the display scan electrodes 104, a dielectric layer 105, and a protective film 106 constitute a front panel of the PDP 100.
  • the display electrodes 103 and the display scan electrodes 104 are both made of silver or the like, and are alternately arranged in parallel in stripes on the surface of the front glass substrate 101 facing the back glass substrate 102.
  • the dielectric layer 105 is made of lead glass or the like, and is formed on the surface of the front glass substrate 101 so as to cover the display electrodes 103 and the display scan electrodes 104.
  • the protective film 106 is made of MgO or the like, and is formed on the surface of the dielectric layer 105.
  • the back glass substrate 102, the address electrodes 108, a visible light reflective layer 109, the barrier ribs 110, and phosphor layers 111R, 111G, and 111B constitute a back panel of the PDP 100.
  • the address electrodes 108 are made of silver or the like, and are aligned in parallel on the surface of the back glass substrate 102 facing the front glass substrate 101.
  • the visible light reflective layer 109 is made of dielectric glass containing titanium oxide or the like, and is formed on the surface of the back glass substrate 102 so as to cover the address electrodes 108.
  • the visible light reflective layer 109 serves to reflect visible light generated from the phosphor layers 111R, 111G, and 111B, and also serves as a dielectric layer.
  • the barrier ribs 110 are arranged on the surface of the visible light reflective layer 109 so as to be parallel to the address electrodes 108.
  • the phosphor layers 111R, 111G, and 111B are applied in turn, to the sides of adjacent barrier ribs 110 and the surface of the visible light reflective layer 109 therebetween.
  • the phosphor layers 111R, 111G, and 111B are made up of phosphor particles that emit light of the respective colors red (R), green (G), and blue (B).
  • a discharge gas e.g. a mixture of 95vol% of neon and 5vol% of xenon
  • a predetermined pressure around 66.5kPa
  • Such a constructed PDP 100 and a PDP drive device 150 shown in FIG. 5 are connected to each other, thereby forming a PDP-equipped display device 160.
  • the PDP 100 is connected to a display driver circuit 153, a display scan driver circuit 154, and an address driver circuit 155 in the PDP drive device 150.
  • a voltage higher than a discharge starting voltage is applied to display scan electrodes 104 and address electrodes 108 in cells which should be illuminated, to induce an address discharge.
  • a pulse voltage is applied to each pair of display electrode 103 and display scan electrode 104 all at once, to initiate a sustain discharge in the cells in which wall charges have been accumulated. Due to this sustain discharge, ultraviolet light is generated from the discharge gas and excites phosphor layers which emit visible light, as a result of which the cells are illuminated.
  • an image is displayed.
  • FIG. 6 is an expanded sectional view of part of the PDP 100 shown in FIG. 4, looking at in the direction x.
  • the dielectric layer 105 is made up of a first dielectric layer 1051 that covers the entire surface of the front glass substrate 101, and a second dielectric layer 1052 that is disposed between the display electrode 103 and the display scan electrode 104.
  • the first dielectric layer 1051 is made of a lead dielectric (with a relative permittivity of about 11) containing PbO (75wt%), B 2 O 3 (15wt%), and SiO 2 (10wt%), which is conventionally used for dielectric layers.
  • the first dielectric layer 1051 is formed so as to cover the display electrode 103, the display scan electrode 104, and the second dielectric layer 1052.
  • the protective film 106 made of MgO or the like.
  • the second dielectric layer 1052 is formed so as to fill the gap between the display electrode 103 and the display scan electrode 104, with a thickness W2 which is equal to or larger than the thicknesses W1 and W3 of the display electrode 103 and display scan electrode 104.
  • the second dielectric layer 1052 is made of a material having a lower relative permittivity than the first dielectric layer 1051.
  • the second dielectric layer 1052 is made of a sodium dielectric which contains Na 2 O (65wt%), B 2 O 3 (20wt%), and ZnO (15wt%) and has a relative permittivity of about 6.5.
  • an area whose relative permittivity is lower than the first dielectric layer 1051 is formed between the display electrode 103 and the display scan electrode 104.
  • an area whose relative permittivity is lower than the first dielectric layer 1051 is formed in the area surrounded on three sides by the display electrode 103, the display scan electrode 104, and the front glass substrate 101. As a result, the capacitance between the display electrode 103 and the display scan electrode 104 is decreased.
  • the surfaces of the display electrode 103 and display scan electrode 104 are covered with the first dielectric layer 1051 whose relative permittivity is high-, so that sufficient wall charges are accumulated during address discharge between the address electrode 108 and the display scan electrode 104. This effectively reduces the chance that illumination failures may occur.
  • the embodied PDP can reduce the amount of current flowing during sustain discharge without causing illumination failures. Hence the panel's power consumption can be kept lower than that of the conventional PDP.
  • the second dielectric layer 1052 is formed so as to fill the entire gap between the display electrode 103 and the display scan electrode 104.
  • the thickness W2 of the second dielectric layer 1052 is smaller than the thicknesses W1 and W3 of the two electrodes 103 and 104, the capacitance between the two electrodes 103 and 104 is decreased to a certain extent, with it being possible to reduce the panel's power consumption.
  • FIG. 7 is a flow diagram showing the process steps (1) to (6) for forming the front panel of the PDP 100, where the second dielectric layer 1052 is formed using metal masking. Each process step is illustrated with an expanded sectional view of part of the front panel looked at in the direction x.
  • the front panel is formed as follows. First, the n display electrodes 103 and the n display scan electrodes 104 (only one pair are shown in FIG. 7) having a stripe shape are alternately deposited in parallel on the front glass substrate 101. Then, the dielectric layer 105 is formed on the front glass substrate 101 over the n display electrodes 103 and the n display scan electrodes 104. Lastly, the protective film 106 is formed on the dielectric layer 105.
  • the display electrode 103 and the display scan electrode 104 are both made of silver or the like.
  • a silver paste e.g. NP-4028 produced by Noritake Co., Ltd.
  • dl about 80 ⁇ m
  • the second dielectric layer 1052 is formed using metal masking in the following way.
  • a metal plate 201 having a long hole 2011 (a hole extending in the direction x) is positioned so that the long hole 2011 lies directly above the gap between the display electrode 103 and the display scan electrode 104.
  • the metal plate 201 is made in the same size as the front glass substrate 101, the positioning of the metal plate 201 can be done easily.
  • a paste 202 containing a sodium dielectric material is applied to the metal plate 201, and a squeegee 2010 is moved to push the paste 202 through the long hole 2011 onto the surface of the front glass substrate 101 between the display electrode 103 and the display scan electrode 104.
  • the width d2 of this long hole 2011 is preferably a little smaller (e.g. 60 ⁇ m) than the spacing dl between the display electrode 103 and the display scan electrode 104, so as to adapt to a case such as where the metal plate 201 is slightly misaligned or where the pitch between the electrodes 103 and 104 is not constant.
  • the paste 202 As an example of the paste 202, a mixture of Na 2 O (65wt%), B 2 O 3 (20wt%), ZnO (15wt%), and an organic binder (10% of ethyl cellulose dissolved in ⁇ -terpineol) is used.
  • the organic binder is a substance obtained by dissolving a resin in an organic solvent.
  • a resin such as an acrylic resin and an organic solvent such as butyl carbitol may be used instead of etyle cellulose and ⁇ -terpineol.
  • a dispersant such as glycertrioleate
  • the panel is fired at a predetermined temperature (e.g. 560°C) for a predetermined period (e.g. 20 minutes), to destroy the organic binder.
  • a predetermined temperature e.g. 560°C
  • a predetermined period e.g. 20 minutes
  • the second dielectric layer 1052 with a predetermined thickness is formed as shown in the step (4).
  • the first dielectric layer 1051 is formed as shown in the step (5).
  • the protective film 106 is deposited on the surface of the first dielectric layer 1051, as shown in the step (6).
  • the protective film 106 is made of MgO or the like, and is formed using sputtering or CVD (chemical-vapor deposition) so as to have a predetermined thickness (about 0.5 ⁇ m).
  • the second dielectric layer 1052 is formed using metal masking in the above example, the second dielectric layer 1052 may be formed using other methods such as nozzle injection.
  • FIG. 8 is a flow diagram showing the process steps (1) to (6) for forming the front panel of the PDP 100, where the second dielectric layer 1052 is formed using nozzle injection. This method is the same as that shown in FIG. 7 except for the process step (2), so that the explanation of the other process steps is omitted here.
  • a paste injection device 2020 is employed to effect nozzle injection.
  • the paste injection device 2020 has a movable carriage (not illustrated) and a nozzle orifice 2021 with a diameter d3. While the paste injection device 2020 or the front glass substrate 101 is being moved relative to the other in the direction x by the movable carriage, the paste injection device 2020 injects the paste 202 supplied from a paste supply device (not illustrated) from the nozzle orifice 2021 onto the surface of the front glass substrate 101 between the display electrode 103 and the display scan electrode 104.
  • the diameter d3 of the nozzle orifice 2021 is preferably a little smaller (e.g. 60 ⁇ m) than the spacing dl between the display electrode 103 and the display scan electrode 104, so as to adapt to a case such as where the paste injection device 2020 is slightly misaligned or where the pitch between the electrodes 103 and 104 is not constant.
  • a silver paste is applied to the surface of the back glass substrate 102 by screen printing, and then the result is fired to align the m address electrodes 108. Then, a paste containing a lead glass substance is applied to the surface of the back glass substrate 102 over the m address electrodes 108 by screen printing, to form the visible light reflective layer 109. Further, a paste containing the same kind of lead glass substance is repeatedly applied in a predetermined pitch to the surface of the visible light reflective layer 109 by screen painting, and the result is fired to form the barrier ribs 110. With these barrier ribs 110, the discharge space is partitioned in the direction x into the discharge spaces 122 which correspond to individual cells for light emission.
  • a phosphor ink in paste form which is made up of phosphor particles of red (R), green (G), or blue (B) and an organic binder is applied to the sides of neighboring barrier ribs 110 and the surface of the visible light reflective layer 109 exposed between the neighboring barrier ribs 110, and then fired at a temperature of 400-590°C to destroy the organic binder, as a result of which the phosphor particles are bound together.
  • the phosphor layers 111R, 111G, and 111B are formed.
  • the above manufactured front panel and back panel are laminated so that the n pairs of electrodes 103 and 104 intersect with the m address electrodes 108.
  • Sealing glass is interposed between the front and back panels along their edges, and fired at a temperature of around 450°C for 10 to 20 minutes to form the airtight sealing layer 121.
  • the front and back panels are fixed together.
  • a discharge gas e.g. an inert gas of He-Xe or Ne-Xe
  • the phosphor ink which is applied to the back panel is prepared by mixing phosphor particles of one of the three colors, a binder, and a solvent, so as to have a viscosity of 15 to 3000 centipoise.
  • a surfactant, silica, a dispersant (0.1 to 5wt%), and the like may be added to such a phosphor ink as necessary.
  • phosphor particles which are common in the art are mixed in the phosphor ink.
  • red phosphor particles a compound such as (Y, Gd) BO 3 :Eu or Y 2 O 3 :Eu is used.
  • the element Eu substitutes for part of the element Y in the host material.
  • a compound such as BaAl 12 O 19 :Mn or Zn 2 SiO 4 :Mn is used as green phosphor particles.
  • the element Mn substitutes for part of an element in the host material.
  • a compound such as BaMgAl 10 O 17 :Eu or BaMgAl 14 O 23 :Eu is used as blue phosphor particles.
  • the element Eu substitutes for part of the element Ba in the host material.
  • ethyl cellulose or an acrylic resin (constituting 0.1 to 10wt% of the ink) is applicable.
  • solvent ⁇ -terpineol or butyl carbitol is applicable.
  • a high polymer such as PMA (polymethacrylic acid) or PVA (polyvinyl alcohol) may be used as the binder, and water or an organic solvent such as diethylene glycol or methyl ether may be used as the solvent,
  • the first dielectric layer parts 1051c and 1051d whose relative permittivity is high are present between the display electrode 103 and the display scan electrode 104. This causes an increase in capacitance between the two electrodes 103 and 104, and therefore the panel's power consumption will not be reduced as effectively as the first embodiment. Nevertheless, when compared with the prior art, the capacitance is decreased to such an extent that a sufficient reduction in power consumption is realized.
  • PDP samples Nos. 1 and 2 were prepared with their front panels having the construction of FIG. 6.
  • the second dielectric layer was made of Na 2 O-B 2 O 3 -ZnO (with a relative permittivity of 6.5) and was formed using metal masking.
  • the second dielectric layer was made of alkoxy silane (OCD type 7 with a relative permittivity of 4, produced by Tokyo Ohka Kogyo Co., Ltd.) and was formed using nozzle injection.
  • PDP samples Nos. 3 to 5 were prepared with their front panels having the construction of FIG. 9.
  • the second dielectric layer was made of Na 2 O-B 2 O 3 -ZnO (with a relative permittivity of 6.5) and was formed by performing an application step, a drying step, and a firing step using metal masking.
  • the second dielectric layer was made of Na 2 O-B 2 O 3 -ZnO (with a relative permittivity of 6.5) and was formed by performing an application step, a drying step, and a firing step using nozzle injection.
  • the sample No. 1 the second dielectric layer was made of Na 2 O-B 2 O 3 -ZnO (with a relative permittivity of 6.5) and was formed by performing an application step, a drying step, and a firing step using nozzle injection.
  • the second dielectric layer was made of alkoxy silane (OCD type 7 with a relative permittivity of 4, produced by Tokyo Ohka Kogyo Co., Ltd.) and was formed by repeating an application step and a drying step three times using nozzle injection and then firing the result at 500°C for 30 minutes.
  • OCD type 7 with a relative permittivity of 4, produced by Tokyo Ohka Kogyo Co., Ltd.
  • PDP samples Nos. 6 and 7 were prepared with their front panels having the construction of FIG. 10.
  • the second dielectric layer was made of Na 2 O-B 2 O 3 -ZnO (with a relative permittivity of 6.5) and was formed using metal masking.
  • the second dielectric layer was made of alkoxy silane (OCD type 7 with a relative permittivity of 4, produced by Tokyo Ohka Kogyo Co., Ltd.) and was formed using nozzle injection.
  • a PDP sample No. 8 was prepared with its front panel having the construction of FIG. 2.
  • Each of the samples Nos. 1-8 was in the size of 200mm ⁇ 300mm.
  • Each of the display electrode and the display scan electrode was formed from a silver paste (NP-4028 by Noritake) so as to have a thickness of 5 ⁇ m and a width of 80 ⁇ m.
  • the thickness of the second dielectric layer was 40 ⁇ m and the thickness of the MgO protective film was 0.5 ⁇ m.
  • a mixture of 95vol% of neon and 5vol% of xenon was enclosed in the discharge spaces as a discharge gas, at a pressure of 66.5kPa.
  • Each of the samples Nos. 1-8 was connected to a PDP drive device of the same construction, and the sustain discharge voltage, the relative luminous efficiency, and the amount of required power at the time of driving the PDP were measured.
  • the input waveform of each of the display electrode and the display scan electrode was a rectangular wave having a frequency of 10kHz and a duty factor of 10%.
  • the comparative sample No. 8 required 66W of power, and exhibited a relative luminous efficiency of 0.60 (1m/W).
  • each of the samples Nos. 1-7 required less than 66W of power, demonstrating an approximately 10% or greater reduction in power consumption in comparison with the sample No. 8. Due to this reduction in power consumption, the relative luminous efficiency was improved to 0.61 (1m/W) or higher. Also, no illumination failures were seen in these samples.
  • the PDP and PDP-equipped display device of the second embodiment has a construction similar to those of the first embodiment shown in FIGS. 3 to 5, and differs only in the construction of the front panel. The following description focuses on this difference.
  • FIG. 11 is an expanded sectional view of part of the PDP of the second embodiment.
  • a dielectric layer 205 is formed so as to cover the display electrode 103 and the display scan electrode 104.
  • the surface of this dielectric layer 205 facing the back panel is dented to provide a groove 207 extending in the direction x between the display electrode 103 and the display scan electrode 104.
  • the dielectric layer 205 has the same composition as the first dielectric layer 1051 in the first embodiment, and shows a relative permittivity of approximately 11.
  • the entire surface of the dielectric layer 205 is coated with a protective film 206 made of MgO or the like.
  • the groove 207 is provided between the display electrode 103 and the display scan electrode 104 which are covered with the dielectric layer 205, and has a length approximately equal to each of the electrodes 103 and 104.
  • the thickness W4 of the dielectric layer 205 at the bottom of the groove 207 is set to be smaller than the thicknesses W5 and W6 of the display electrode 103 and display scan electrode 104.
  • Such a groove 207 is part of the discharge spaces 122 and so has an atmosphere in which a certain amount of discharge gas is enclosed in a vacuum. Accordingly, the relative permittivity of the area occupied by the groove 207 is approximately 1. In other words, with the presence of the groove 207, an area whose relative permittivity is lower than the dielectric layer 205 is formed in the area surrounded on three sides by the display electrode 103, the display scan electrode 104, and the front glass substrate 101.
  • the panel's power consumption is reduced for the same reason as explained in the first embodiment.
  • the relative permittivity of the groove 207 is lower than the second dielectric layer 1052 in the first embodiment, the power consumption is reduced by a greater degree than in the first embodiment.
  • the method of manufacturing the PDP of the second embodiment is the same as that of the first embodiment, except for the manufacture of the front panel, so that the following explanation focuses on this difference.
  • FIG. 12 is a flow diagram showing the process steps (1) to (7) for forming the groove 207 of the dielectric layer 205 using sandblasting, where each process step is illustrated with an expanded sectional view of part of the front panel looked at in the direction x.
  • the front panel is manufactured as follows. First, the n display electrodes 103 and the n display scan electrodes 104 (only one pair are shown in FIG. 12) having a stripe shape are alternately disposed in parallel on the front glass substrate 101. Then, the dielectric layer 205 is formed on the front glass substrate 101 over the n display electrodes 103 and the n display scan electrodes 104. Lastly, the protective film 206 is formed on the dielectric layer 205.
  • the display electrode 103 and the display scan electrode 104 are both made of silver or the like. They are formed by applying a silver paste to the surface of the front glass substrate 101 at a predetermined spacing (about 80 ⁇ m) by screen printing, and then firing the result.
  • the same kind of lead glass paste used for the first dielectric layer 1051 in the first embodiment is applied to the entire surfaces of the front glass substrate 101, display electrode 103, and display scan electrode 104 using screen printing, the result then being dried to form the dielectric layer 205 as shown in the step (1) in FIG. 12.
  • a resist film 210 is laminated on the surface of the dielectric layer 205.
  • the resist film 210 is preferably formed from a material having an ultraviolet cure property, though this is not a limit for the present invention.
  • the resist film 210 is exposed to ultraviolet light through a photomask 211 in which the position of the groove 207 is specified, as a result of which the resist film 210 is divided into exposed parts 2101 and an unexposed part 2102.
  • the resist film 210 is then developed to remove the unexposed part 2102 which has not been cured. Hence the pattern shown in the step (4) is obtained.
  • Such a patterned front panel then undergoes sandblasting. As a result, part of the dielectric layer 205 which is not covered with the exposed parts 2101 is removed as shown in the step (5).
  • the exposed parts 2101 of the resist film 210 are delaminated, and the result is fired. In so doing, the dielectric layer 205 dries and shrinks. Hence the dielectric layer 205 with the smooth-shaped groove 207 is obtained as shown in the step (7).
  • the MgO protective film 206 is formed on the dielectric layer 205 using electron beam evaporation (see FIG. 11). This completes the front panel.
  • the groove 207 of the dielectric layer 205 is formed using sandblasting
  • the invention should not be limited to such.
  • the groove 207 may be formed using a photosensitive dielectric paste.
  • FIG. 13 is a flow diagram showing the process steps (1) to (5) for forming the groove 207 of the dielectric layer 205 using a photosensitive dielectric paste.
  • the display electrode 103 and the display scan electrode 104 are formed on the front glass substrate 101 in the same way as in the step (1) in FIG. 12.
  • the same kind of lead glass paste used for the first dielectric layer 1051 in the first embodiment is mixed with, for example, an ultraviolet photosensitive resin which is photo-curing.
  • the mixture is then applied to the entire surfaces of the display electrode 103, display scan electrode 104, and front glass substrate 101 by screen printing, and the result is dried to form the dielectric layer 205.
  • the dielectric layer 205 is exposed to ultraviolet light through the same photomask 211 used in the step (3) in FIG. 12, and then developed to remove an unexposed part. Hence the groove 207 is formed as shown in the step (4). After this, the dielectric layer 205 is dried and fired, and as a result shrinks. This completes the dielectric layer 205 with the groove 207 as shown in the step (5).
  • the MgO protective film 206 is formed on the dielectric layer 205 using electron beam evaporation. This completes the front panel.
  • FIG. 16 is an expanded sectional view of part of a front panel according to this modification.
  • the front panel includes the front glass substrate 101, a display electrode 213, a display scan electrode 214, dielectric layers 225a and 225b, and a protective film 226.
  • This front panel can be formed in the following way.
  • the dielectric layer 225a is formed on the front glass substrate 101 with a predetermined interval using screen printing.
  • the display electrode 213 and the display scan electrode 214 having a strip shape are aligned on the dielectric layer 225a using screen printing, so as to lie over the edges of the dielectric layer 225a facing the interval.
  • the dielectric layer 225b is applied so as to entirely cover the display electrode 213, the display scan electrode 214, and the dielectric layer 225a, and then dried and fired.
  • the edges of the dielectric layer 225a shrink, thereby providing a groove 237.
  • the display electrode 213 and the display scan electrode 214 become inclined toward the groove 237.
  • the distance W24 between the front glass substrate 101 and the bottom of the groove 237 (i.e. the thickness of the dielectric layer 225b at the bottom of the groove 237) is set shorter than the largest distances W25 and W26 between the front glass substrate 101 and the electrodes 213 and 214.
  • an area whose relative permittivity is lower than the dielectric layers 225a and 225b is formed in the area surrounded on three sides by the display electrode 213, the display scan electrode 214, and the front glass substrate 101. In so doing, the power consumption during sustain discharge is reduced as in the second embodiment.
  • PDP samples Nos. 9 to 11 were prepared with their front panels having the construction of FIG. 11.
  • the dielectric layer was made of PbO-B 2 O 3 -SiO 2 (with a mixture ratio of 75wt%:15wt%:10wt%) and was formed using sandblasting.
  • the dielectric layer was made of PbO-B 2 O 3 -SiO 2 (75wt%:15wt%:10wt%) and was formed using a photosensitive dielectric paste.
  • the sample No. 11 had the same construction as the sample No. 9, but the discharge gas pressure was higher (320kPa).
  • PDP samples Nos. 12 and 13 were prepared with their front panels having the construction of FIG. 14.
  • the discharge gas'pressure was 66.5kPa.
  • the discharge gas pressure was 320kPa.
  • PDP samples Nos. 14 and 15 were prepared with their front panels having the construction of FIG. 15.
  • the discharge gas pressure was 66.5kPa.
  • the discharge gas pressure was 320kPa.
  • PDP samples Nos. 16 and 17 were prepared with their front panels having the construction of FIG. 16.
  • the discharge gas pressure was 66.5kPa.
  • the discharge gas pressure was 320kPa.
  • PDP samples Nos. 18 and 19 were prepared with their front panels having the construction of FIG. 2.
  • the discharge gas pressure was 66.5kPa.
  • the discharge gas pressure was 320kPa.
  • Each of the samples Nos. 9-19 was in the size of 200mm ⁇ 300mm.
  • Each of the display electrode and the display scan electrode was formed from a silver paste (NP-4028 by Noritake), so as to have a thickness of 5 ⁇ m and a width of 80 ⁇ m.
  • the MgO protective film was formed using electron beam evaporation so as to have a thickness of 0.5 ⁇ m.
  • a mixture of 95vol% of neon and 5vol% of xenon was enclosed in the discharge spaces as a discharge gas.
  • each of the samples Nos. 9-19 was connected to a PDP drive device of the same construction, and the sustain discharge voltage, the relative luminous efficiency, and the amount of required power at the time of driving the PDP were measured.
  • the input waveform of each of the display electrode and the display scan electrode was a rectangular wave having a frequency of 10kHz and a duty factor of 10%.
  • the sample No. 18 required 340V of voltage and 42W of power for sustain discharge, and exhibited a relative luminous efficiency of 0.50 (1m/W).
  • each of the samples Nos. 9, 10, 12, 14, and 15 required no more than 300W of voltage and no more than 37W of power, demonstrating an approximately 10% or greater reduction in sustain discharge voltage and power consumption in comparison with the prior art. Also, no illumination failures were observed in these samples. The effects were similar when the discharge gas pressure was raised.
  • the PDP and PDP-equipped display device of the third embodiment has a construction similar to those of the first embodiment shown in FIGS. 3 to 5, and differs only in the construction of the front panel. The following description focuses on this difference.
  • FIG. 17 is an expanded perspective view of part of a front panel in the PDP of the third embodiment.
  • the construction elements which are the same as those in the first embodiment shown in FIGS. 3-5 have been given the same reference numerals and their explanation has been omitted.
  • the plurality of pairs of display electrodes 103 and display scan electrodes 104 are aligned on the front glass substrate 101.
  • a dielectric layer 305 is formed so as to cover the display electrode 103 and the display scan electrode 104.
  • a hollow 307 is provided to part of the dielectric layer 305 which is present between the display electrode 103 and the display scan electrode 104 and which is opposed to an address electrode in a back panel (not illustrated).
  • the dielectric layer 305 has the same composition as the first dielectric layer 1051 in the first embodiment, and shows a relative permittivity of approximately 11.
  • the entire surface of the dielectric layer 305 is coated with a protective film 306 made of MgO or the like.
  • the hollow 307 is provided -such that the thickness of the dielectric layer 305 at the bottom of the hollow 307 (i.e. the distance between the front glass substrate 101 and the bottom of the hollow 307) is smaller than the thicknesses of the two electrodes 103 and 104 (i.e. the distances between the front glass substrate 101 and the pair of electrodes 103 and 104).
  • Such a hollow 307 forms part of the discharge spaces which are filled with a discharge gas having a low relative permittivity, like the groove 207 in the second embodiment.
  • a discharge gas having a low relative permittivity like the groove 207 in the second embodiment.
  • FIG. 18 is a sectional view of part of this front panel where the thickness of the dielectric layer 305 at the bottom of the hollow 307 is varied.
  • PDP samples were prepared that differ in the thickness of the dielectric layer 305 at the bottom 307a of the hollow 307, and the luminous efficiency and the minimum sustain discharge voltage were measured for each distance between the surface of the pair of electrodes 103 and 104 (both are 10 ⁇ m in thickness) and the bottom 307a in the direction z.
  • the direction in which the surface of the dielectric layer 305 at the bottom 307a becomes farther from the front glass substrate 101 than the surface of each electrode in the direction z is referred to as a positive direction
  • the direction in which the surface of the dielectric layer 305 at the bottom 307a becomes closer to the front glass substrate 101 than the surface of each electrode in the direction z is referred to as a negative direction.
  • the hollow 307 forms a discharge space in which a small amount of discharge gas is enclosed in a vacuum, and therefore its relative permittivity is as low as approximately 1, as in the second embodiment.
  • Such a hollow 307 can be formed using sandblasting or a photosensitive dielectric paste, as explained in the first and second embodiments.
  • the protective film 306 may be provided with a gap at the bottom of the hollow 307, as in the modification (2) of the second embodiment. In so doing, the same effects as the modification (2) of the second embodiment are attained.
  • the PDP and PDP-equipped display device of the fourth embodiment has a construction similar to those of the first embodiment shown in FIGS. 3 to 5, and differs only in the construction of the front panel. The following description focuses on this difference.
  • FIG. 23 is an expanded sectional view of part of a front panel of the PDP according to the fourth embodiment.
  • a plurality of display electrodes 403 and a plurality of display scan electrodes 404 are aligned on the front glass substrate 101 with a predetermined spacing L.
  • a dielectric layer 405 and a protective film 406 are formed on the front glass substrate 101 so as to cover the electrodes 403 and 404.
  • the dielectric layer 405 is provided with a groove 407 which extends along each electrode, in an area surrounded on three sides by the display electrode 403, the display scan electrode 404, and the front glass substrate 101.
  • This construction is the same as the first embodiment, but the fourth embodiment differs with the first embodiment in that the aspect ratio of each of the display electrode 403 and the display scan electrode 404 is specified.
  • Each of the display electrode 403 and the display scan electrode 404 is rectangular in cross section, and has a width W41 and a thickness W42.
  • the aspect ratio W42/W41 of each of these electrodes is set to be in the range of 0.07 to 2.0, where the thickness W42 is preferably in the range of 3 to 20 ⁇ m.
  • An electrode with such a high aspect ratio can be formed by repeating a printing step and a drying step until a predetermined film thickness is obtained, and then firing the result.
  • the aspect ratio of each of the display electrode 403 and the display scan electrode 404 is set to be 0.07 or higher for the following reason. If the aspect ratio is lower than 0.07, the electrical resistance of the electrode becomes unstable, which renders the electrode unfit for its intended use. This has been demonstrated by experiment. To stabilize the electrical resistance, the aspect ratio is preferably 0.15 or higher. On the other hand, if the aspect ratio exceeds 2.0, the electrical resistance increases, which causes an increase in the panel's power consumption. This has been experimentally demonstrated, too.
  • the thickness W42 of each of the display electrode 403 and the display scan electrode 404 is set to be no greater than 20 ⁇ m for the following reason.
  • the electrode is formed using a thin film formation process or a thick film formation process which are common in the art, the electrode cannot be made thicker than 20 ⁇ m.
  • the thin film formation process it is difficult to form a thick film, whereas in the thick film formation process a film thickness changes during a firing step and so a predetermined shape cannot be maintained.
  • the reason why the thickness W42 is set to be no smaller than 3 ⁇ m is that a film thickness smaller than 3 ⁇ m causes a sharp increase in electrical resistance, thereby rendering the electrode unusable.
  • the thickness W42 of each of the display electrode 403 and the display scan electrode 404 is preferably in the range of 3-20 ⁇ m.
  • the width W41 of each of the display electrode 403 and the display scan electrode 404 is preferably in the range of 43 to 70pm.
  • the dielectric layer 405 has the same composition as the first dielectric layer 1051 in the first embodiment, and shows a relative permittivity of approximately 11.
  • the groove 407 is provided such that the thickness W43 of the dielectric layer 405 at the bottom of the groove 407 (i.e. the distance between the bottom of the groove 407 and the front glass substrate 101) is smaller than the thickness W42 of each of the display electrode 403 and the display scan electrode 404.
  • This groove 407 forms part of discharge spaces which are filled with a discharge gas of a low relative permittivity, like the groove 207 in the second embodiment.
  • the aspect ratio W42/W41 of each of the display electrode 403 and the display scan electrode 404 (0.07 ⁇ W42/W41 ⁇ 2.0) is higher than that of an electrode in the conventional art (about 0.05). Accordingly, if the cross-sectional area of each of the electrodes 403 and 404 is equal to that of the conventional electrode, the width W41 can be made smaller. Since each of the electrodes 403 and 404 are made of a metal with a low visible light transmittance, the shielding area of the electrode in the visible light transmission direction can be decreased by making the width W41 smaller. Even when the cell pitch between the display electrode 403 and the display scan electrode 404 is small, the required spacing L between the two electrodes 403 and 404 can be secured within the cell of the limited size. As a result, the panel's opening ratio increases and the discharge spaces become wider, with it being possible to improve the luminous efficiency of the panel.
  • each of the display electrode 403 and the display scan electrode 404 having a high aspect ratio is thicker than the conventional electrode, the area of one of the electrodes facing the other increases. Accordingly, by forming the deep groove 407, the volume of the discharge space interposed between the display electrode 403 and the display scan electrode 404 increases. As a result, a high electric field strength is attained in a wide space between the two electrodes 403 and 404. This decreases the discharge starting voltage at the time of sustain discharge when compared with the conventional art, so that the panel's power consumption is further reduced.
  • the groove 407 can be formed using sandblasting or a photosensitive dielectric paste, as explained in the first and second embodiments.
  • PDP samples were prepared, with their front panels having a construction similar to those in the first experiment but differing in size and/or shape of the display electrode and display scan electrode.
  • a PDP sample No. 20 was prepared with its display electrode and display scan electrode being rectangular in cross section, as shown in FIG. 23.
  • the display electrode and the display scan electrode were 30 ⁇ m in width and 15 ⁇ m in thickness (the aspect ratio of 0.5).
  • the spacing between the two electrodes was 100 ⁇ m.
  • a PDP sample No. 21 was prepared with its display electrode and display scan electrode being pyramidal in cross section, as shown in FIG. 24.
  • the display electrode and the display scan electrode were 50 ⁇ m in width on the side of the front glass substrate, and 15 ⁇ m in thickness (the aspect ratio of 0.3).
  • the spacing between the two electrodes was 100 ⁇ m.
  • PDP samples Nos. 22-24 were prepared.
  • the display electrode and the display scan electrode were in the same size as the sample No. 20, and the thickness W53 of the dielectric layer between the display electrode and the display scan electrode was greater than the thickness W42 (15 ⁇ m) of each electrode, as shown in FIG. 25.
  • the thickness W53 of the dielectric layer was 40 ⁇ m (shown by (A) in FIG. 25).
  • the thickness W53 was 30 ⁇ m (shown by (B) in FIG. 25).
  • the thickness W53 was 15 ⁇ m ((C) in FIG. 25).
  • the display electrode and the display scan electrode were 30 ⁇ m in width and 15 ⁇ m in thickness (the aspect ratio of 0.5).
  • the spacing between the two electrodes was 100 ⁇ m.
  • the thickness of the dielectric layer other than the part between the display electrode and the display scan electrode was 40 ⁇ m.
  • a PDP sample No. 25 was prepared with a construction similar to the sample No. 22, where the display electrode and the display scan electrode were shaped in pyramid as the sample No. 21.
  • a PDP sample No. 26 was prepared with its display electrode and display scan electrode being shaped like a thin flat plate, as shown in FIG. 2.
  • the display electrode and the display scan electrode were 100 ⁇ m in width and 5 ⁇ m in thickness (the aspect ratio of 0.05).
  • Each of the samples Nos. 20-26 was connected to a PDP drive device of the same construction, and the sustain discharge voltage, the relative luminous efficiency, and the amount of required power at the time of driving the PDP were measured.
  • the input waveform of each of the display electrode and the display scan electrode was a rectangular wave having a frequency of 10kHz and a duty factor of 10%.
  • the comparative sample No. 26 required 340V of voltage and 42W of power for sustain discharge, and exhibited a relative luminous efficiency of 0.50 (1m/W).
  • each of the samples Nos. 20 and 21 required no greater than 37W of power and no greater than 320V of voltage, demonstrating an approximately 6% or greater reduction in sustain discharge voltage and power consumption in comparison with the sample No. 26. Also, the relative luminous efficiency was 0.71 (1m/W) or higher, showing a 40% or greater improvement in comparison with the sample No. 26. Further, no illumination failures were seen in these samples.
  • the above embodiments describe the case where the barrier ribs have a stripe shape, but this is not a limit for the invention.
  • the barrier ribs may be arranged in a lattice pattern in which auxiliary barrier ribs are provided between neighboring barrier ribs.
  • the barrier ribs may be shaped in meandering lines.
  • the display electrodes and display scan electrodes are formed from silver in the above embodiments, but they may be formed from other materials.
  • well-known transparent electrodes may be added as auxiliary electrodes for the display electrodes and display scan electrodes. In this case, the aspect ratio of the transparent electrodes need not be limited.

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US6650053B2 (en) 2003-11-18
KR20010078093A (ko) 2001-08-20
EP1126499A3 (fr) 2004-05-26
EP1770745A2 (fr) 2007-04-04
CN1319868A (zh) 2001-10-31
CN101090054B (zh) 2010-05-26
CN101090054A (zh) 2007-12-19
US20010015623A1 (en) 2001-08-23

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